(ORDO NEWS) — Researchers at the Yunnan Observatory of the Chinese Academy of Sciences have announced their new findings on pulsating eclipsing Algol-type (EA) binaries.
Based on data from the TESS Transiting Exoplanet Survey Satellite (TESS), 57 new pulsating stars from 1626 EA-type eclipsing binaries were discovered.
The study was published March 28 in The Astrophysical Journal Supplement Series.
Eclipsing binaries are the most reliable objects for obtaining absolute stellar parameters from photometric and spectroscopic data.
And pulsating stars are important for detecting internal structure and measuring distances. Therefore, the study of a pulsating star in a binary system can help in understanding the stellar structure and evolution.
In April 2018, NASA launched TESS as an exoplanet exploration mission. The main task of TESS is to search for planets passing through bright and nearby stars throughout the sky.
Meanwhile, its high-precision photometric data also provides unparalleled opportunities for studying binars and variable stars.
Using data from 1,626 eclipsing EA-type binaries observed by TESS, the researchers found 57 new pulsating stars in eclipsing binaries and confirmed their parameters, such as the period and amplitude of the pulsation.
Preliminary results show that 43 objects are δ Sct components in classical semi-detached EA-type eclipsing binaries, and the remaining 14 objects are other types of variable stars in eclipsing binaries.
The discovery of these new objects increases the total number of pulsating stars in eclipsing binaries by 20-25%. These pulsating stars can help further study of mass transfer, tidal forces, and component pulsations in binary stars.
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